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These simulations are part of the international CLIVAR Climate of the 20th Century Plus(C20C+) Detection and Attribution sub-project.

The two primary purposes of the D&A subproject are:• to characterise historical trends and variability in the probabilities of damaging weather events, including thedifferences across climate models;• to estimate the fraction of the historical, present, and future probabilities of damaging weather events that isattributable to anthropogenic emissions, and to characterise underlying uncertainties in these estimates.

The experimental design comprises various large ensembles of atmospheric model simulations run under different historical scenarios of external radiative forcing and surface boundary conditions. The core experiment, comprises two scenarios:All-Hist: Simulations run under observed variations in radiative forcing and surface boundary conditions.Nat-Hist: Simulations run under variations that might have occurred in radiative forcing and surface boundaryconditions had anthropogenic emissions never interfered with the climate system.

Research Data Australia is the data discovery service of the Australian National Data Service (ANDS).
ANDS is supported by the Australian Government through the National Collaborative Research Infrastructure Strategy Program.
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